Fig. 1From: Initial clinical experience of surface guided stereotactic radiation therapy with open-face mask immobilization for improving setup accuracy: a retrospective studyOpen-face mask immobilization system used in this study: a the mask consisted of two shells, b illustration for typical patient immobilization, where the green shade is for anonymization, c typical reference surface in AlignRT, where the white area represents the ROI contour for surface trackingBack to article page